Position sensor coupling structure

Abstract

This utility model provides a position sensor connection structure, including a valve stem, a linkage mechanism, and a position sensor. The linkage mechanism includes a valve stem connection assembly, a guide rail, a connecting rod assembly, and a lever. The valve stem connection assembly is movably connected to the valve stem along its extension direction. The guide rail extends horizontally and is connected to the valve stem connection assembly. The first end of the lever is fixedly connected to the spindle of the position sensor. The connecting rod assembly is horizontally positioned between the guide rail and the second end of the lever, and both ends of the connecting rod assembly are slidably arranged along the extension direction of the guide rail and the extension direction of the lever, respectively. This eliminates the jamming and forced disengagement problems caused by the conflict between linear and rotary motions through synchronous sliding adjustment of the guide rail and the lever. It avoids valve position feedback deviations caused by lag in motion transmission in traditional rigid fixed structures, ensuring reliable connection and improving equipment durability. Combined with the connecting rod assembly, it achieves motion transmission and conversion, enabling real-time feedback of valve opening.

Description

Technical Field

[0001] This utility model relates to the field of valve position control technology, and in particular to a position sensor connection structure. Background Technology

[0002] In automated industrial fields such as petrochemicals, metallurgy, energy, and chemicals, valve position closed-loop control is a core component to ensure the continuity, safety, and cycle efficiency of the production process. It relies on position sensors to provide real-time feedback on the valve position, ensuring that the automated control unit and the valve body form a closed-loop response, thus avoiding production fluctuations or safety risks caused by valve position deviations.

[0003] However, existing connectors mostly adopt rigid fixed structures or simple plug-in structures. In this way, high-frequency vibrations in the industrial environment will continuously act on the plug-in or fixed parts of the connectors, causing traditional connectors to easily loosen or detach. At the same time, temperature fluctuations in the field environment will cause changes in the fit clearance of the various components of the connector due to the difference in the thermal expansion coefficient of the materials. This can cause valve position feedback delays or drifts, or even cause the connectors to jam or be forcibly disengaged. In severe cases, it can trigger the system safety protection mechanism, leading to an emergency shutdown of the entire production line.

[0004] Therefore, it is necessary to propose a position sensor connection structure to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a position sensor connection structure to solve the problem that the valve position connector in the prior art is easy to loosen and fall out of the lock, but the connection is not tight enough and cannot adapt to changes in the working condition gap.

[0006] To achieve the above objectives, this utility model provides a position sensor connection structure, including a valve stem, a linkage mechanism, and a position sensor. The position sensor is fixed to the valve body frame and spaced apart from the valve stem. The position sensor has a rotatable spindle. The linkage mechanism includes a valve stem connecting assembly, a guide rail, a connecting rod assembly, and a lever. The valve stem connecting assembly is movably connected to the valve stem along the extension direction of the valve stem. The guide rail extends horizontally and is connected to the valve stem connecting assembly. The first end of the lever is fixedly connected to the spindle of the position sensor. The connecting rod assembly is transversely positioned between the guide rail and the second end of the lever, and both ends of the connecting rod assembly are slidably arranged along the extension direction of the guide rail and the extension direction of the lever, respectively.

[0007] Preferably, the valve stem connection assembly includes a valve stem connection block and a pressure plate. The valve stem connection block is movably connected to the valve stem along the extension direction of the valve stem. The guide rail is U-shaped. One side of the valve stem connection block is recessed to form two first semicircular grooves arranged vertically opposite each other. One side of the pressure plate is recessed to form a second semicircular groove corresponding to the first semicircular groove. The pressure plate is connected to the valve stem connection block so that one end of the guide rail is inserted into the space enclosed by the first semicircular groove and the second semicircular groove.

[0008] Preferably, the linkage assembly includes a slider and a connecting rod. The slider is slidably connected to the guide rail along the extension direction of the guide rail. The first end of the connecting rod is connected to the slider, and the second end of the connecting rod is slidably connected to the lever along the extension direction of the lever.

[0009] Preferably, the slider has two vertically opposite sliding channels that extend along the length of the guide rail. The sliding channels are used for the guide rail to pass through and connect, so that the slider can be slidably mounted on the guide rail.

[0010] Preferably, the second end of the lever is recessed to form a groove extending along its own length, and the second end of the connecting rod passes through the groove and is connected by a nut to be slidably disposed along the groove.

[0011] Preferably, the connecting rod assembly further includes a locking block, the slider has a shaft hole extending along its own width direction, the first end of the connecting rod passes through the shaft hole, and the first end of the connecting rod has an internal thread, the locking block is threadedly connected to the protruding section of the first end of the connecting rod to be attached to one side of the slider.

[0012] Preferably, the shaft hole has a curved inner wall formed inward on the side near the locking block, and the locking block has an annular protrusion formed at one end facing the shaft hole. The diameter of the annular protrusion gradually decreases along the direction towards the shaft hole, and the annular protrusion is used to be embedded in the curved inner wall.

[0013] Preferably, the clearance between the guide rail and the inner wall of the sliding channel is ≤0.05mm.

[0014] Preferably, the pressure plate is bolted to the end of the valve stem connecting block near the position sensor.

[0015] Preferably, the valve stem has external threads, and the valve stem connecting block is threadedly connected to the valve stem to be movably disposed along the extension direction of the valve stem.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a position sensor connection structure, including a valve stem, a linkage mechanism, and a position sensor. The position sensor is fixed to the valve body frame and spaced apart from the valve stem. The position sensor has a rotatable spindle. The linkage mechanism includes a valve stem connection assembly, a guide rail, a connecting rod assembly, and a lever. The valve stem connection assembly is movably connected to the valve stem along its extension direction. The guide rail extends horizontally and is connected to the valve stem connection assembly. The first end of the lever is fixedly connected to the spindle of the position sensor. The connecting rod assembly is transversely positioned between the guide rail and the second end of the lever, and both ends of the connecting rod assembly are slidably arranged along the extension direction of the guide rail and the extension direction of the lever, respectively. This eliminates the jamming and forced disengagement problems caused by the conflict between linear and rotary motions through synchronous sliding adjustment of the guide rail and lever. It avoids valve position feedback deviations caused by lag in motion transmission in traditional rigid fixed structures, ensuring reliable connection and improving equipment durability. Combined with the connecting rod assembly, it achieves motion transmission and conversion, enabling real-time feedback of valve opening. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure in one embodiment of the present utility model; Figure 2 This is a plan view of the overall structure in one embodiment of the present utility model; Figure 3 This is an exploded view of the assembly of the locking block in one embodiment of the present invention. Figure 4 This is a three-dimensional schematic diagram of the slider in one embodiment of the present invention.

[0019] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Valve stem; 20. Linkage mechanism; 210. Valve stem connecting assembly; 211. Valve stem connecting block; 212. Pressure plate; 220. Guide rail; 230. Linkage assembly; 231. Slider; 2311. Shaft hole; 232. Linkage rod; 240. Toggle lever; 241. Slide groove; 250. Locking block; 30. Position sensor. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0025] Please see the appendix Figure 1-4 The present invention provides a connection structure for a position sensor 30 in one embodiment, comprising a valve stem 10, a linkage mechanism 20, and a position sensor 30. The position sensor 30 is fixed on the valve body frame and spaced apart from the valve stem 10. The position sensor 30 has a rotatable spindle. The specific design is as follows: The linkage mechanism 20 includes a valve stem 10 connecting assembly, a guide rail 220, a connecting rod assembly 230, and a lever 240. The valve stem 10 connecting assembly is movably connected to the valve stem 10 along the extension direction of the valve stem 10. The guide rail 220 extends horizontally and is connected to the valve stem 10 connecting assembly. The first end of the lever 240 is fixedly connected to the spindle of the position sensor 30. The connecting rod assembly 230 is transversely positioned between the guide rail 220 and the second end of the lever 240, and the two ends of the connecting rod assembly 230 are slidably arranged along the extension direction of the guide rail 220 and the extension direction of the lever 240, respectively.

[0026] Specifically, the position sensor 30 connection structure in this application includes a valve stem 10, a linkage mechanism 20, and a position sensor 30. The valve stem 10 is a component that realizes the opening and closing of the valve position of the equipment. It usually relies on the position sensor 30 to provide real-time feedback on the valve position to ensure that the automatic control unit and the valve body action form a closed-loop response, and avoid production fluctuations or safety risks caused by valve position deviation. Therefore, the position sensor 30 is directly installed on the valve body frame to be close to the valve stem 10. It is spaced apart from the valve stem 10 so as to be linked through the linkage mechanism 20, so that the up and down movement of the valve stem 10 is converted into a signal of the opening and closing degree of the position sensor 30.

[0027] The linkage mechanism 20 includes a valve stem 10 connecting assembly, a guide rail 220, a connecting rod assembly 230, and a lever 240. The valve stem 10 connecting assembly is used to adjust the valve position along the vertical position of the valve stem 10 to complete the valve opening and closing, and is used to install and connect the guide rail 220 so that the guide rail 220 can move in real time with the valve stem 10 connecting assembly. The lever 240 is used to transmit the position to the spindle of the position sensor 30 by rotation, and achieves synchronization through the connecting rod assembly 230, ensuring that the valve stem 10 action is transmitted to the subsequent guide rail 220 and connecting rod assembly 230 without delay, avoiding the valve position feedback deviation caused by the lag in action transmission in the traditional "rigid fixed" structure; while the connecting rod assembly 230 horizontally... Positioned between the guide rail 220 and the lever 240, with both ends slidably set along the extension directions of the guide rail 220 and the lever 240 respectively, it perfectly adapts to two different motion trajectories: "linear movement of the guide rail 220 with the valve stem 10" and "rotational movement of the lever 240 around the spindle". When the guide rail 220 moves up and down with the valve stem 10 connecting member, its vertical position change will drive the lever 240 to rotate around the spindle through the connecting rod assembly 230. Both ends of the connecting rod assembly 230 are slidably set to avoid rigid damage, thereby completely solving the jamming and wear problems caused by the conflict of motion forms of traditional connecting members, realizing accurate and smooth feedback of valve opening to the sensor, and eliminating the "disengagement and jamming" fault from the root.

[0028] In a preferred embodiment of this utility model, the valve stem 10 connecting assembly includes a valve stem 10 connecting block and a pressure plate 212. The valve stem 10 connecting block is movably connected to the valve stem 10 along the extension direction of the valve stem 10. The guide rail 220 is U-shaped. One side of the valve stem 10 connecting block is recessed to form two first semicircular grooves arranged vertically opposite each other. One side of the pressure plate 212 is recessed to form a second semicircular groove corresponding to the first semicircular groove. The pressure plate 212 is connected to the valve stem 10 connecting block so that one end of the guide rail 220 is inserted into the space enclosed by the first semicircular groove and the second semicircular groove.

[0029] It should be noted that the valve stem 10 has external threads, and the valve stem 10 connecting block can be movably mounted on the valve stem 10 along its extension direction via a threaded connection. The guide rail 220 is designed in a U-shape, possessing high structural rigidity and horizontal extension accuracy, ensuring the straightness of the sliding trajectory of the slider 231. Furthermore, the first semi-circular groove of the valve stem 10 connecting block and the second semi-circular groove of the pressure plate 212 form an enclosing space, providing a "ring-like" fixation to the end of the guide rail 220. Compared to traditional single-bolt fixation, this results in a more uniform fixing force and avoids... The bending deformation of the rail 220 due to the eccentric force ensures the sliding accuracy of the slider 231 and reduces linkage deviation. The pressure plate 212 is detachably connected to the valve stem 10 connecting block. During assembly, the guide rail 220 only needs to be inserted into the enclosed space and the pressure plate 212 locked. No complex welding or one-piece molding process is required, which can meet the needs of rapid offline installation. During subsequent maintenance, the pressure plate 212 can be disassembled for quick replacement and maintenance, which greatly reduces the equipment downtime for maintenance and is suitable for upgrading and retrofitting existing equipment. Preferably, bolt connection can be used to achieve disassembly and connection.

[0030] In a preferred embodiment of the present invention, the linkage assembly 230 includes a slider 231 and a connecting rod 232. The slider 231 is slidably connected to the guide rail 220 along the extension direction of the guide rail 220. The first end of the connecting rod 232 is connected to the slider 231, and the second end of the connecting rod 232 is slidably connected to the lever 240 along the extension direction of the lever 240.

[0031] It should be noted that the first end of the connecting rod 232 is connected to the slider 231, and the second end can slide along the extension direction of the lever 240, forming a "dual degree of freedom" adaptation structure. This structure can disperse the combined stress generated by the up-and-down movement of the valve stem 10 and the rotation of the lever 240 to the two dimensions of sliding of the slider 231 and sliding of the connecting rod 232. This avoids the breakage of the connecting rod 232 and the deformation of the lever 240 caused by local stress concentration, significantly improving the service life of the components and meeting the design goal of "durability".

[0032] In a preferred embodiment of the present invention, the slider 231 has two vertically opposite sliding channels, which extend along the length of the guide rail 220. The sliding channels are used for the guide rail 220 to pass through and connect, so that the slider 231 can be slidably disposed on the guide rail 220.

[0033] It is worth noting that the two sliding channels are adapted to the U-shaped structure of the guide rail 220, allowing the two tracks of the guide rail 220 to pass through and connect respectively. It should be noted that the fit clearance between the guide rail 220 and the inner wall of the sliding channel is ≤0.05mm, thereby avoiding the slider 231 from shaking due to excessive clearance, thus ensuring the accuracy of the action transmitted by the connecting rod 232. This significantly reduces the deviation between the valve opening detected by the position sensor 30 and the actual valve position, meeting the high precision requirements of automated closed-loop control. Furthermore, the tight fit clearance can effectively prevent oil mist and dust in the industrial environment from entering the mating surface of the slider 231 and the guide rail 220, reducing the increase in sliding resistance or component corrosion and wear caused by contaminants, extending the service life of the slider 231 and the guide rail 220, and reducing the maintenance frequency.

[0034] In a preferred embodiment of the present invention, the second end of the lever 240 is recessed to form a sliding groove 241 extending along its own length direction, and the second end of the connecting rod 232 passes through the sliding groove 241 and is connected by a nut to be slidably arranged along the sliding groove 241.

[0035] It is worth noting that the groove 241 provides sliding space for the connecting rod 232 to adapt to the rotation of the lever 240 when it is connected with the nut (for example, when the lever 240 rotates, the end point of the connecting rod 232 will move along the length of the lever 240), thus avoiding motion interference.

[0036] Furthermore, the connecting rod assembly 230 also includes a locking block 250. The slider 231 has a shaft hole 2311 extending along its own width direction. The first end of the connecting rod 232 passes through the shaft hole 2311, and the first end of the connecting rod 232 has an internal thread. The locking block 250 is threadedly connected to the protruding section of the first end of the connecting rod 232 to be attached to one side of the slider 231.

[0037] It should be noted that the first end of the connecting rod 232 passes through the shaft hole 2311 of the slider 231 and has an internal thread. After the locking block 250 is threadedly connected to the connecting rod 232, it is pressed against one side of the slider 231, forming an axial constraint on the connecting rod 232. This can eliminate the risk of the connecting rod 232 coming out of the shaft hole 2311 of the slider 231 under high-frequency vibration. Moreover, the threaded connection allows for fine adjustment of the axial position of the connecting rod 232 by rotating the locking block 250, ensuring that the connection between the connecting rod 232, the slider 231, and the lever 240 is in the best condition, avoiding inaccurate feedback due to assembly position deviation, and improving the overall linkage accuracy.

[0038] Furthermore, the shaft hole 2311 has a curved inner wall formed inward on the side near the locking block 250, and the locking block 250 has an annular protrusion formed at one end facing the shaft hole 2311. The diameter of the annular protrusion gradually decreases along the direction towards the shaft hole 2311, and the annular protrusion is used to be embedded in the curved inner wall.

[0039] It should be understood that the curved inner wall of the shaft hole 2311 and the tapered annular protrusion of the locking block 250 form a "surface contact" fit. Compared with the traditional "planar contact", the contact area is larger and the locking force is more evenly distributed. This can avoid cracking of the shaft hole 2311 or deformation of the locking block 250 caused by local stress concentration, and improve the durability of the structure.

[0040] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A position sensor connection structure, characterized in that, The system includes a valve stem, a linkage mechanism, and a position sensor. The position sensor is fixed to the valve body frame and spaced apart from the valve stem. The position sensor has a rotatable spindle. The linkage mechanism includes a valve stem connecting assembly, a guide rail, a connecting rod assembly, and a lever. The valve stem connecting assembly is movably connected to the valve stem along the extension direction of the valve stem. The guide rail extends horizontally and is connected to the valve stem connecting assembly. The first end of the lever is fixedly connected to the spindle of the position sensor. The connecting rod assembly is transversely positioned between the guide rail and the second end of the lever, and both ends of the connecting rod assembly are slidably arranged along the extension direction of the guide rail and the extension direction of the lever, respectively.

2. The position sensor connection structure according to claim 1, characterized in that, The valve stem connection assembly includes a valve stem connection block and a pressure plate. The valve stem connection block is movably connected to the valve stem along the extension direction of the valve stem. The guide rail is U-shaped. One side of the valve stem connection block is recessed to form two first semicircular grooves arranged vertically opposite each other. One side of the pressure plate is recessed to form a second semicircular groove corresponding to the first semicircular groove. The pressure plate is connected to the valve stem connection block so that one end of the guide rail is inserted into the space enclosed by the first semicircular groove and the second semicircular groove.

3. The position sensor connection structure according to claim 2, characterized in that, The linkage assembly includes a slider and a connecting rod. The slider is slidably connected to the guide rail along the extension direction of the guide rail. The first end of the connecting rod is connected to the slider, and the second end of the connecting rod is slidably connected to the lever along the extension direction of the lever.

4. The position sensor connection structure according to claim 3, characterized in that, The slider has two vertically opposite sliding channels that extend along the length of the guide rail. The sliding channels are used for the guide rail to pass through and connect, so that the slider can be slidably mounted on the guide rail.

5. The position sensor connection structure according to claim 3, characterized in that, The second end of the lever is recessed to form a sliding groove extending along its own length. The second end of the connecting rod passes through the sliding groove and is connected by a nut to be slidably disposed along the sliding groove.

6. The position sensor connection structure according to claim 4, characterized in that, The linkage assembly also includes a locking block. The slider has a shaft hole extending along its width direction. The first end of the linkage passes through the shaft hole and has an internal thread inside. The locking block is threadedly connected to the protruding section of the first end of the linkage to be attached to one side of the slider.

7. The position sensor connection structure according to claim 6, characterized in that, The shaft hole has a curved inner wall formed inward on the side near the locking block. The locking block has an annular protrusion at one end facing the shaft hole, and the diameter of the annular protrusion gradually decreases along the direction towards the shaft hole. The annular protrusion is used to be embedded in the curved inner wall.

8. The position sensor connection structure according to claim 4, characterized in that, The clearance between the guide rail and the inner wall of the sliding channel is ≤0.05mm.

9. The position sensor connection structure according to claim 2, characterized in that, The pressure plate is bolted to the end of the valve stem connecting block near the position sensor.

10. The position sensor connection structure according to claim 2, characterized in that, The valve stem has external threads, and the valve stem connecting block is threadedly connected to the valve stem and is movably disposed along the extension direction of the valve stem.

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